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np205 tcase fluid in th350

Discussion in 'The Garage' started by wazzabie, Aug 26, 2005.

  1. wazzabie

    wazzabie 1/2 ton status Premium Member

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    Any one had any problems with tcase fluid getting into the tranny via bad seals? This is a big concern for me.
     
  2. Stomper

    Stomper ΜΟΛΩΝ ΛΑΒΕ GMOTM Winner

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    Have you??

    With the preasure the trans makes I don't think it can go that way. Now ATF in the 205 can and does happen. Just make sure you have a good seal and you'll be fine.
     
  3. sweetk30

    sweetk30 professional hooker Premium Member

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    you do not want gear oil in the auto tranny.
     
  4. wazzabie

    wazzabie 1/2 ton status Premium Member

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    Never had gear oil in the tranny but when I picked up my NP205 I was surprised to find ATF fluid in it. I pulled it from a 72 for my 78. I guess it doesn;t hurt to run ATF fluid and I figure it would prevent any problems if the fluids mixed.
     
  5. sweetk30

    sweetk30 professional hooker Premium Member

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    some people dont know what goes in so any oil does at the time. that tcase that old should be gear oil. and just change the seals while out. you dont want to swap it out again any time soon as its big and heavy.
     
  6. big_o_blazer

    big_o_blazer Registered Member

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    i wouldnt worry

    here in the army thats what we put in the HMMWV's transmission and tranfers is dextron 3 (ATF) works just fine i dont know what kinda transfer they use but ive never seen a problem cause of the ATF
     
  7. RustyParts

    RustyParts 1/2 ton status

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    Never seen that happen, usually the other way round, but you might want to check the vents on your transfer case. May be plugged allowing pressure to build, pushing gear lube into tranny.
     
  8. wazzabie

    wazzabie 1/2 ton status Premium Member

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    Good point Rusty Parts. Also GM calls for gear oil in the np205.
     
  9. Blazer1970

    Blazer1970 1/2 ton status

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    There is nothing wrong with running ATF in a 205. It was factory spec for some years.
     
  10. wazzabie

    wazzabie 1/2 ton status Premium Member

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    Interesting... do you know what year ATF was called for?
     
  11. sweetk30

    sweetk30 professional hooker Premium Member

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    all 205's same in side . so atf or gear oil as you wish. just run it like you would and check to make sure case isnt over heating . if so might want to run gear oil.
     

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